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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0499981 (2000-02-08) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 15 인용 특허 : 7 |
An anti-vacuum drain cover is defined by a centrally supported grating together with at least one outwardly extending tributary tube. When the grating is obstructed, the fluid may still be suctioned through at least one tributary tube preventing the formation of vacuum conditions within the main dra
[ What is claimed is:] [1.]1. An anti-vacuum drain cover comprising: a body having a top portion, draining openings formed in the top portion through which liquid is suctioned therethrough; at least one tributary tube extending from the body and defining an outboard end and scalloped in the vertical
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